-nellessen



(No Model.)

H. J. NELLESSEN.

MILLSTONE VENTILATOR. No. 282,357;

Patented July 81, 1883.

u. Finns. rum-imam. Wahingtm. n. c

Pennsylvania,

which usually occurs, eration or during grinding can be kept cooler UNITED STATES 'PATENT Orrics.

HERMANN NELLESSEN, or rrrrsnunc, PENNSYLVANIA.

M LLSTONE-VENTI LATOR.

SPECIFICATION forming part of Letters Patent No. 282,357, dated July 31, 1883.

Application filed January 8. 1883.

(No model.)

To all whom it may concern:

Be it known that I, HERMANN J. NnLLEs- SEN, a citizen of Prussia, residing at Pittsburg, in the county of Allegheny and State of have invented certain new and useful Improvements in Millstone-Ventilators and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the. art to which it appertains to make and use the same.

My invention relates to improvements in millstone-ventilators, and the objects are to ventilate millstones and obviate the heating so that the stones in opand a higher speed maintained, to produce a better quality andlarger quantity of product, to prevent any loss of fine flour-dust, to prevent any condensation of vapors arising from the flour, and to prevent theproducts of condensation from falling back into the sieves from the exhaust-pipe through which the air is drawn by an exhaust-fan or vacuum apparatus. l

The nature of the invention consists in the construction and arrangement of parts, as will be more fully described hereinafter, and specifically pointed out in the claims, reference being had to the accompanying drawings and the letters of reference marked thereon.

Like letters of reference indicate similar parts in the different figures of the drawings, in which Figure l is a vertical crosssection of a pair of millstones with the ventilator attached. Fig.

2 is a skeleton planof the arrangement of radiating sieve-frames, and Fig. 3 is a cross-section of the same.

In the accompanying drawings, A is the stationary or fixed stone, and B the runner, which is supported on the ordinary bail, b, and spindle 0. These stones are inclosed in a perfectly air-tight curb or housing, D, having a central opening, 0, to which aleather tube or hose, E, is secured, and, extending downward, is secured to a flanged ring, F. The hose may be made of any similar close material, if desired. This ring has atongue, f, that fits into a groove, 9, in the bush or ring G, which is secured in the eye of the runner B, so as to form a perfectly-tight joint. In close proximity to the upper side of the runner is suspended an annular sieve, H, consisting of a series of radiating frames, h, attached 'to an inner ring, '5, and an outer ring, it, which are secured together by radial rods 6, and to these frames a covering of suitable flannel, bolting-cloth, or similar material, d, is secured.

The sieve H is suspended from the upper part of the curb by flexible connections, so that it receives a vibratory motion caused by the blast. The object of this sieve is to prevent any particles of flour from being drawn out through the exhaust or suction pipe I. I11 the suction-pipe is arranged a damper, Z, to regulate the draft or close it altogether, and said 'pipe is connected to a suction-fan or vacuum apparatus. The entire upper part of the curb, as well as the pipe I, is lined with felt m, or equivalent non-conducting material, preferably held in place by perforated sheet metal or galvanized iron, to prevent condensation of the vapors originating during the grinding process.

In the outlet-spout K, or what might be called overflow, is arranged an enlargement, at, in which a revoluble bucket-wheel,

L, slowly moves, and is fitted close enough to the sides of the enlargement to prevent any escape, or ingress of air. Any particles of flour dropping into said spout are slowly carried off by it to a suitable receptacle.

The operation is as follows: When the millstones are started and the exhaust-fan receives motion, the air will be drawn through the opening c,passing between the two millstones, around them, and out through the outlet-pipe, as indicated by the arrows. Any fine particles of flour that would escape or be carried upward toward the outlet-pipe are prevented from passing out by means of the annular sieve, which permits the air to pass through it, and yet allows a free circulation of said air. If at any time the spout should become clogged up by flour, it canbe easily cleaned thereof by rapping or knocking against the. shaft S of the damper fl, and the sieve can be cleaned by knocking upon the curb, which will liberate the particles of flour adhering to it.

I am aware of the Patents No. 183, 248, to L. H. Behrens, No. 260,877, to G. Kiefer, and No. i

211,033, to M. Martin, and disclaim the construction therein shown; but,

Having thus described my invention, What I claim, and desire to secure by Letters Patent, 5 1s- 1. In a millstoneventilator, the annular sieve H, consisting of rings and 7c, rods 6, frames h, and flannel or similar material, (1, in combination with the curb and flexible connec- ,IO tions, in the manner shown and specified.

2. The herein-described millstone-ventilator, consisting of the curb provided with a felt and perforated metal lining, the curved exhaust-pipe I, similarly lined, damper Z, the a1i nular sieve H, constructed as described, the 15 flexible connections, the leather hose E, provided with ring F, bush G, the outlet-pipe K, having enlargement n, and the bucket-wheel L, all constructed and arranged substantially as shown and specified. 20

In testimony whereof I hereby affix my sig nature in presence of two witnesses.

HERMANN J. NELLESSEN.

Vitnesses: WVM. 1\/IITTENZWEY, J OHN F. WALTER. 

